Install libqt5designer5 by entering the following commands in the terminal:
sudo apt update sudo apt install libqt5designer5
Description:
Qt 5 designer module
Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. . The QtDesigner module provides classes that allow you to create your own custom widget plugins for Qt Designer, and classes that enable you to access Qt Designer's components.
Homepage: https://www.qt.io/developers/
Version: 5.9.5-0ubuntu1
Section: universe/libs